Add WBS Task into cProject

hi~

Could I get some help u guys~~~~~

so hard to solve the problem for me!!!

unfortunately, my client made a mistake today.

she deleted WBS Task in cProject.

so she wanna restore WBS Task to its former condition.

I try to restore WBS but I really dont know how solve the problem,

Could u guys help me to find a way? Pls~~

thanks and regards~